The OpenBSD team has released OpenBSD 4.5. There have been lots of changes and bug fixes, but it's a rather daunting list that doesn't really lend itself towards a summary (hint), but I guess if you use OpenBSD you are perfectly capable of figuring this out yourself. You can get the new release from the download page.

Exactly. I started learning on Mandrake Linux back in grade 9. I then proceeded to try Red Hat and then sticking with Debian for a while. My friend introduced me to OpenBSD 3.0 at first (just after pf was introduced and back when I thought the installer was really difficult. Ha!).

The amount I learnt from getting my hands in OpenBSD was astronomically more than any of those OS' and it clearly isn't an OS designed for someone who wants to take the "Easy Train". There are some other BSD derivatives out there (based on OpenBSD as well I believe) that do a better job for your average Joe Winston.